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We have a 4 node Hyper-V cluster running about 15 VMs. On none of them I have tested, can I inspect or edit VHDXs on running VMs. I get a permissions error of some kind when attempting to do so:

Error message

Given that the VMs are running, the hosts obviously have access to the files. I can browse to the location of the files and see them, and I can see currently Everyone has Full Control.

What else would prevent me from editing the disk given the above permissions?

James Edmonds
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  • I was unaware that you could edit the disk of a running VM. Have you tried shutting down one of the VM's and trying it? – joeqwerty May 07 '21 at 18:25
  • I was lead to believe with VHDX type disks this could be done online. I am not currently in a position to shutdown the VM to test this. – James Edmonds May 10 '21 at 08:40

1 Answers1

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The cause of my problem seemed to stem from the fact these VMs were being managed by WSFC (failover clustering), which prevented the Hyper-V manager from making these changes.

If I instead tried this process using failover clustering manager, I was able to expand the disk while the VM was online.

James Edmonds
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